FIG. 4.

Overview of the putatively identified metabolites detected in the global metabolome screen. A total of 229 metabolites could be assigned putative identities based on database matching. By far the largest class of detected metabolites were lipids (107 metabolites) and in particular a large number of short- and medium-chain fatty acids. The second-largest class contained amino acids (AA) and their derivatives (66 metabolites), including a large number of di- and tripeptides, many of which contained proline and glycine residues.